Year	Percent
1996-01-01	22.855700000000000
1997-01-01	20.185700000000000
1998-01-01	22.096999999999998
1999-01-01	21.626600000000000
2000-01-01	21.443000000000000
2001-01-01	23.113500000000000
2002-01-01	23.442200000000000
2003-01-01	23.319400000000000
2004-01-01	28.059800000000000
2005-01-01	29.954900000000000
2006-01-01	32.796300000000000
2007-01-01	34.048100000000000
2008-01-01	35.511800000000000
2009-01-01	35.053300000000000
2010-01-01	34.615300000000000
2011-01-01	35.613700000000000
2012-01-01	35.080600000000000
2013-01-01	35.003500000000000
2014-01-01	36.135100000000000
2015-01-01	34.820100000000000
2016-01-01	35.119700000000000